114 questions · from 5 interviews · 2 asked more than once
Publicis Sapient interview questions
Every question candidates reported from their Publicis Sapient interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Publicis Sapient coding and DSA questions
- 01
HashMap Internal Working
Explain the internal working of HashMap, including resizing and treeification.
Asked 2 times · From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 02
Find Unique Sorted Alphabets in String
Given a string, find all unique alphabets within it and return them in sorted order.
Easy · From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 03
SQL Query: High-Value Purchases Last Year
Write an SQL query to find users who purchased items worth more than 10,000 from a selected month of the previous year.
Medium · From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 04
TreeMap Internal Working
Explain the internal working mechanism of a TreeMap.
- 05
Find Common Elements in Two Lists (Java)
Write code to find the common elements (intersection) between two lists in Java.
- 06
Find Nearest Number in Sorted Array
Given a sorted array, find the number closest to a target value.
- 07
Multithreaded Printing with Specific Sequence
Design a program where three threads (t1, t2, t3) print numbers in a specific interleaved sequence: t1 - 1, t2 - 2, t3 - 3, t1 - 4, t2 - 5, and so on.
- 08
0/1 Knapsack Variation
A dynamic programming problem that could be broken down into a 0/1 Knapsack problem structure, though it was not a direct application of the classic Knapsack.
Medium · From Giving back to the leetcode community. How I got an on campus job offer!
- 09
Shortest Path with Intermediate Nodes
Find the shortest route from node A to node B in a graph, with the constraint that two specific intermediate nodes, X and Y, must be visited, and always in the order X then Y. This problem can be solved by applying Dijkstra's Algorithm multiple times.
Medium · From Giving back to the leetcode community. How I got an on campus job offer!
Publicis Sapient system design questions
- 01
API Versioning Approaches
Explain different approaches to API versioning, specifically URI-based and Header-based methods.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 02
Database Pagination Strategies
Discuss different strategies for implementing pagination efficiently in database queries.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 03
Handling Large Datasets in Database
Explain techniques for efficiently handling queries and operations on tables with millions of rows.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 04
Redis Cache Usage and Strategy
Discuss common use cases for Redis as a cache and different caching strategies.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 05
Database Sharding Concepts
Explain the concepts behind database sharding and its benefits/drawbacks.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 06
Efficient Large Dataset Retrieval
Explain strategies and techniques to retrieve large datasets from a system without exhausting memory resources.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 07
API Performance Optimizations
Discuss various techniques and considerations for optimizing the performance of APIs.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 08
Database Personal Data Security
As a non-functional requirement, how would you secure the personal data of your user within your database?
- 09
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- 11
Best Distributed System Messaging: Kafka, SQS, RabbitMQ
For a distributed system, which messaging queue is best among Kafka, SQS, and RabbitMQ?
- 12
Distributed Systems: Delivery Guarantees
What are the different types of delivery guarantees in distributed systems?
- 13
Correlation ID
Explain what a Correlation ID is and its use in distributed systems.
- 14
Error Handling in Kafka
Describe strategies for error handling in Kafka.
- 15
OpenAPI Specification
What is the OpenAPI specification and how is it used?
- 16
- 17
API Error Handling
Discuss general strategies for API error handling.
- 18
401 vs. 403 Error
Explain the difference between 401 Unauthorized and 403 Forbidden HTTP status codes.
- 19
Synchronous and Asynchronous Interaction
Explain synchronous and asynchronous interaction in distributed systems.
- 20
Working of Circuit Breaker
Explain how a Circuit Breaker pattern works.
- 21
Local Transaction in Microservices
How are local transactions handled in a microservices architecture?
- 22
Saga Pattern
Explain the Saga pattern for distributed transactions.
- 23
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- 25
8 more in the Publicis Sapient write-ups.
Publicis Sapient behavioural and HR questions
- 01
Incorporating Project Feedback
Describe a situation where you received feedback on a project from someone else and how you went about incorporating their ideas.
From Giving back to the leetcode community. How I got an on campus job offer!
- 02
Helping Peers with Technical Projects
Share an experience where you assisted your peers with a technical project they were working on.
From Giving back to the leetcode community. How I got an on campus job offer!
- 03
Why Publicis Sapient?
Explain your motivation for wanting to work at Publicis Sapient.
From Giving back to the leetcode community. How I got an on campus job offer!
Publicis Sapient other questions
- 01
Fail-Fast vs. Fail-Safe Iterators
What is the difference between fail-fast and fail-safe iterators?
Asked 2 times · From Publicis Sapient | L2 Plateform
- 02
Builder Pattern Use Cases & Immutability
Discuss the use cases of the Builder Pattern and its relation to immutability.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 03
Singleton Pattern Deep Dive
Discuss the Singleton Pattern in depth, including Eager vs Lazy initialization, and answer output-based questions on OOP principles related to it.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 04
Thread Lifecycle
Explain the different states and transitions in a thread's lifecycle.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 05
Synchronization
Explain synchronization in Java, including its mechanisms and why it's needed.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 06
Volatile vs Atomic
Compare and contrast 'volatile' keyword with 'Atomic' classes in Java.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 07
Race Conditions
Explain what race conditions are and how to prevent them.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 08
Deep Dive on Garbage Collection
Discuss the latest Garbage Collection algorithms (G1 GC, ZGC), heap structure, GC tuning basics, and Stop-the-world events.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 09
Functional Interfaces with Stream Examples
Explain functional interfaces and demonstrate their usage with Java Stream API examples.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 10
Internal Working of Serialization
Explain how serialization works internally in Java.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 11
Serializable vs Externalizable
Compare and contrast Serializable and Externalizable interfaces in Java.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 12
Preventing Serialization Issues
Discuss common issues with serialization and how to prevent them.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 13
JUnit Basics
Explain the basic concepts and usage of JUnit for unit testing.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 14
Mockito Basics
Explain the basic concepts and usage of Mockito for mocking.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 15
Mocking vs Stubbing
Differentiate between mocking and stubbing in the context of testing.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 16
Spring Boot Controller with Best Practices
Demonstrate how to write a Spring Boot Controller class adhering to best practices.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 17
Spring Boot Exception Handling
Discuss best practices and common approaches for exception handling in Spring Boot applications.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 18
Spring Bean Scopes
Explain different Spring Bean scopes: Singleton, Prototype, Request, and Session.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 19
Writing a JWT Filter
Explain how to implement a JWT filter for authentication in Spring Security.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 20
Securing Endpoints with Spring Security
Discuss methods and configurations for securing REST endpoints using Spring Security.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 21
JWT Token Flow
Describe the end-to-end flow of a JWT token, from generation to validation.
From Publicis Sapient – SAT L1 Interview Experience (3.5 Hours | Java + Spring Boot Heavy) [Selected]
- 22
Controlled vs Uncontrolled Components in React
Explain the differences between Controlled and Uncontrolled Components in React.
From Publicis Sapient | Senior Experience Engineer - React | August 2025 | 3.5 YOE
- 23
Create Uncontrolled Form with Reset
Implement a form using Uncontrolled Components in React. The form should have username and password fields and a submit button. On submission, log the field values to the console and reset only the form fields, not the entire form.
From Publicis Sapient | Senior Experience Engineer - React | August 2025 | 3.5 YOE
- 24
Basic CSS Styling for Form
Apply basic CSS styling to the form created in the previous question.
From Publicis Sapient | Senior Experience Engineer - React | August 2025 | 3.5 YOE
- 25
Use Cases for Uncontrolled Components
Discuss the common use cases and scenarios where Uncontrolled Components are preferred in React.
From Publicis Sapient | Senior Experience Engineer - React | August 2025 | 3.5 YOE
44 more in the Publicis Sapient write-ups.
Publicis Sapient interview questions FAQ
What questions are asked in Publicis Sapient interviews?
Candidates reported 114 distinct questions across 5 Publicis Sapient interviews. 9 coding and DSA questions, 33 system design questions, 3 behavioural and HR questions, 69 other questions.
Which Publicis Sapient interview questions are asked most often?
The most repeated are "HashMap Internal Working" (2 times), "Fail-Fast vs. Fail-Safe Iterators" (2 times).
How difficult are Publicis Sapient interview questions?
Of the questions candidates rated, 14% were easy, 71% medium and 14% hard.